Calling shuttle now turns red lights in hallways (a bit different from fire alarm one).

Also every 90 seconds siren is played.

code/datums/shuttle_controller.dm

@@ -20,7 +20,7 @@ datum/shuttle_controller
 		fake_recall = 0 //Used in rounds to prevent "ON NOES, IT MUST [INSERT ROUND] BECAUSE SHUTTLE CAN'T BE CALLED"
 		deny_shuttle = 0 //for admins not allowing it to be called.
 		departed = 0
-
+		sound_siren = 1 //if siren should go off
 	// call the shuttle
 	// if not called before, set the endtime to T+600 seconds
 	// otherwise if outgoing, switch to incoming
@@ -34,6 +34,13 @@ datum/shuttle_controller
 		else
 			settimeleft(SHUTTLEARRIVETIME*coeff)
 			online = 1
+		//turning on the red lights in hallways and siren
+		for(var/area/A in world)
+			if(istype(A, /area/hallway))
+				A.readyalert()
+		sound_siren = 1
+
+
 
 	proc/recall()
 		if(direction == 1)
@@ -45,6 +52,11 @@ datum/shuttle_controller
 			world << sound('shuttlerecalled.ogg')
 			setdirection(-1)
 			online = 1
+			//turning off the red lights in hallways and siren
+			for(var/area/A in world)
+				if(istype(A, /area/hallway))
+					A.readyreset()
+			sound_siren = 0
 
 
 	// returns the time (in seconds) before shuttle arrival
@@ -83,6 +95,11 @@ datum/shuttle_controller
 			var/timeleft = timeleft()
 			if(timeleft > 1e5)		// midnight rollover protection
 				timeleft = 0
+			if (sound_siren)	//playing siren every 90 seconds
+				sound_siren = 0
+				world << sound('siren.ogg')
+				spawn(900)
+					sound_siren = 1
 			switch(location)
 				if(0)
 					if(timeleft>timelimit)